<template>
  <div id="app">
    <div>
      <span>姓名:</span>
      <input type="text" v-model="name"/>
    </div>
    <div>
      <span>年龄:</span>
      <input type="number" v-model="age"/>
    </div>
    <div>
      <span>性别:</span>
      <select v-model="gender">
        <option value="男">男</option>
        <option value="女">女</option>
      </select>
    </div>
    <div>
      <button @click="add">添加/修改</button>
    </div>
    <div>
      <table
        border="1"
        cellpadding="10"
        cellspacing="0"
      >
        <tr>
          <th>序号</th>
          <th>姓名</th>
          <th>年龄</th>
          <th>性别</th>
          <th>操作</th>
        </tr>
        <tr v-for="(item,index) in stu" :key="index">
          <td>{{index+1}}</td>
          <td>{{item.name}}</td>
          <td>{{item.age}}</td>
          <td>{{item.gender}}</td>
          <td>
            <button @click="del(index)">删除</button>
            <button @click="edit(index)">编辑</button>
          </td>
        </tr>
      </table>
    </div>
  </div>
</template>
<script>
export default {
  data() {
    return {
      stu: [
        { name: "李雷", age: 18, gender: "男" },
        { name: "韩梅梅", age: 16, gender: "女" },
      ],
      name: "",
      age: "",
      gender: "",
      editIndex: null,
    };
},
methods:{
    add(){
        if(!this.name||!this.age||!this.gender)return
        let obj ={
            name:this.name,
            age:this.age,
            gender:this.gender
        }
        // 判断是添加还是编辑
        if(this.editIndex!==null){
            this.$set(this.stu,this.editIndex,obj)
            this.editIndex=null
        }else(this.stu.push(obj))
        this.name=this.age=this.gender=''
    },
    del(i){
        this.stu.splice(i,1)
    },
    edit(i){
        this.name=this.stu[i].name
        this.age=this.stu[i].age
        this.gender=this.stu[i].gender
        this.editIndex=i
    }
}


}

</script>
